Duolandrevus (Eulandrevus) dendrophilus ( Gorochov, 1988 )

Zheng, Yanna & Ma, Libin, 2021, Taxonomy of the genus Duolandrevus Kirby, 1906 (Orthoptera: Gryllidae; Landrevinae) from China with a new species of the subgenus Eulandrevus Gorochov, 1988, Zootaxa 4942 (2), pp. 252-268 : 263-264

Duolandrevus (Eulandrevus) dendrophilus ( Gorochov, 1988)

( Fig 10–11 )

Eulandrevus dendrophilus Gorochov, 1988: 7

Duolandrevus (Eulandrevus) dendrophilus, Warchalowska-Sliwa , et al., 1997: 31; Kim & Pham, 2014: 62; Gorochov, 2016: 54; Zhang, et al., 2017: 313; Chen, et al., 2019: 553–562

Examined materials. 12 males. China: Sichuan, Chunzhou, Jiguanshan , Jul. 28, 2020, coll. He, Zhixin ( SNNU) ; 11 males and 2 females. China: Sichuan, E’meishan, Aug. 4, 2020, coll. He, Zhixin ( SNNU) ; 10 males and 8 females. China: Sichuan, Jinyunshan , Aug. 8, 2020, coll. He, Zhixin ( SNNU) ; 1 male. China: Guangxi, Longzhou, Nongang , Sep. 22, 2020, coll. He, Zhixin and Zhang, Tao ( SNNU) ; 5 males. China: Guangxi, Damingshan Jul. 28, 2019, coll. He, Zhixin ( SNNU) ; 3 males. China: Hongkong, Dalanshan , May. 3, 2018, coll. Ma, Libin ( SNNU) ; 10 males and 19 female female. China: Hongkong, Damaoshan , May. 9, 2018, coll. Ma, Libin ( SNNU) ; 2 females. China: Hongkong, Ma’anshan , May. 14, 2018, coll. Ma, Libin ( SNNU) ; 1 male. China: Shenzhen, Dapeng Peninsula National Geopark , Nov. 11, 2018, coll. Peng, Zhong ( SNNU) ; 6 males. China: Guangdong, Nanling , Sep. 1, 2019, coll. He, Zhixin ( SNNU) ; 2 males. China: Guangdong, Jiulong Lake , Oct. 31, 2014, coll. Zhang, Tao ( SNNU) .

Measurements (mm). Male: BL 19.71±1.76; HL 3.50±0.58; HW 5.01±0.37; PL 3.50±0.84; PW 4.65±0.43; FWL 6.43±0.53; HFL 10.87±1.80; HTL 5.93±0.31; Female: BL 16.30±1.15; HL 2.88±0.05; HW 4.43±0.06; PL 2.71±0.02; PW 4.48±0.08; FWL 2.99±0.23; HFL 10.22±0.34; HTL 6.52±0.11; OL 8.58±0.51.

Description. Male: Head smooth and shining, slightly wider than pronotum. Vertex broad and flattened, weakly inclined. Frontal rostrum slightly convex in frontal view, slightly broad in dorsal view and slightly wider than antennal scape. Face transversely broad, area of antennal socket and area of lower side of eye distinctly depressed, between two areas ridged; cheek shiny and plump. Median ocellus small and transversely oval-like; lateral ocelli large and rounded. Clypeus extremely small, distal narrowed portion short. Labrum rhombus-like, with angle lateral margins and concave apically. End section of maxillary palpi longer than the third; end section of labial palpi longer than remainder sections, depressed and widened.

Pronotum widened and depressed; anterior margin concave and arch-like, posterior margin straight. Middle of both lateral edges slightly convex. Hind wings undeveloped, small (reaching posterior margin of metanotal gland) and entirely covered by forewings. Tegmina reaching the middle of the sixth abdominal tergite. Oblique veins five. Chord veins three, basally connected and converging on CuA veins. Mirror inconspicuous, replaced by multiple irregular wing cells, of them, most of proximal ones somewhat larger than the apical ones. A chord vein and wing cells connected by two transvers veins. Apical field armed with reticulated veins. Lateral field bearing six branches of Sc vein.

Both inner and outer tympana oval-like and the inner slightly larger than outer one. Hind tibiae equipped with spines on the half of proximal portion and spurs on distal part (numbered 4:5) and inner apical spurs longer than the outer ones. First tarsus of hind leg armed with spines respectively on sides. Super-anal plate simple, trapezoid-like. Subgenital plate pike-like.

Genitalia ( Fig. 11 ): Genitalia tapering distally in dorsal view. Middle lobes of epiphallus short and thick. Lateral lobes of epiphallus about three times longer than the middle lobe; its tip apically bifurcate and included angle between branches formed as acute angle, and each branch armed with acute apex, and lower branches slightly shorter than upper one. Epiphallus ventrally possessing two lateral projections, the anterior one short and somewhat as long as epiphallic middle lobe, and the posterior one about 1.5 times longer than the anterior. Ectoparameres acute, about 1.5 times longer than epiphallic middle lobe.

Coloration: Body dark brown. Lower part of fronto-clypeal suture proximally yellowish. Femur yellowishbrown. Cercus yellowish-brown proximally and apically brown.

Female: Similar to male. Body colored brown. Forewing reaching posterior to the second abdominal segment, with longitudinal veins, which short inside and gradually lengthening outwards. Ovipositor brown, smooth and arrow-shaped, almost as long as posterior femur.

Remark. This species is related to Duolandrevus (Eulandrevus) ivani ( Gorochov, 1988) , but is distinct in lateral lobes of the epiphallus which are bifurcate. In addition to the type locality of Vietnam, this species is widespread in the south of China. Size of body as well as size and number of wing cells that replacing mirror are varied among individuals in species. Most literature recorded this species do not possess hindwings ( Chen et al., 2019; Gorochov, 1988, 2016; Kim & Pham, 2014; Warchalowska-Sliwa, Maryanska-Nadachowska, & Gorochov, 1997; Zhang et al., 2017a). However, we found it bears hind wings. These wings are undeveloped, rather small (almost reaching posterior margin of metanotal gland) and entirely covered by forewings.

Figures

FIGURE 10. Body of Duolandrevus (Eulandrevus) dendrophilus. A. male; B. female. Scale bar: 10 mm.

FIGURE 11. Genitalia of Duolandrevus (Eulandrevus) dendrophilus. A. dorsal viewed; B. lateral viewed; C. ventral viewed.